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Nicely done
Let a = cost of type 1, b = cost of type 2. Question: is a < b?
(1) 6a + 4b < 4a + 8b
⇒ 2a < 4b ⇒ a < 2b.
This does not force a < b (e.g., a = 1.5, b = 1 satisfies a < 2b but a > b). Insufficient.
(2) 5a + 4b < 4a + 5b
⇒ a < b.
Sufficient.
Answer: B


Souradeep17
let type 1 item be x and type 2 item price be y

Option 1:
6x+4y<4x+8y
2x<4y
x<2y

Can't say if y is greater than X from this . Not sufficient.

Option 2:
5x+4y<4x+5y
x<y
Sufficient to answer. Hence B should be the answer

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